Vitamin D has a multitude of important benefits: it is important for normal, healthy cell growth and function, helps support normal, healthy insulin secretion, and helps support healthy immune function.† Vitamin D is very often used for immune support and bone health and is essential for calcium and phosphorus absorption and utilization.† Stimulates osteoblast (bone producing cell) activity, which helps maintain bone density and strength.† Stimulates the synthesis of osteocalcin, an important protein involved in bone formation.† Helps maintain adequate blood calcium levels, which help support cellular metabolic processes and cardiovascular and neuromuscular/neurological function.